Share a caseSign in
EmissionsSeverity Medium: diagnose soon

P0471Exhaust Pressure Sensor "A" Circuit Range/Performance

What it means

The exhaust pressure sensor signal is electrically possible, but it doesn't make sense compared with other sensors or with what the engine is doing. The exhaust pressure sensor measures the exhaust back pressure (on diesels, before the turbo or the DPF).

Symptoms

  • Check engine light
  • Possibly limp mode or poor regeneration

Common causes

  • Blocked or split sensor pipe
  • Sensor contaminated with soot
  • Real exhaust restriction

What to check first

  1. Key on, engine off: the reading should match atmospheric pressure
  2. Check the sensor pipe for blockage and cracks
  3. Compare readings at idle and 3,000 rpm
Can I drive with P0471? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

Cases with P0471 (0)

Share yours

No published cases with this code yet.

Colleagues asking about P0471

Ask for help

Stuck on P0471? Describe what you measured and ask the community.

P0471: questions and answers

What does P0471 mean?

P0471: Exhaust Pressure Sensor "A" Circuit Range/Performance. The exhaust pressure sensor signal is electrically possible, but it doesn't make sense compared with other sensors or with what the engine is doing. The exhaust pressure sensor measures the exhaust back pressure (on diesels, before the turbo or the DPF).

What are the symptoms of P0471?

Check engine light. Possibly limp mode or poor regeneration.

What causes P0471?

Blocked or split sensor pipe. Sensor contaminated with soot. Real exhaust restriction.

How do you diagnose P0471?

1. Key on, engine off: the reading should match atmospheric pressure 2. Check the sensor pipe for blockage and cracks 3. Compare readings at idle and 3,000 rpm

Can I drive with P0471?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.